最新刊期
卷 30 ， 期 7 ， 2010
- 摘要：DSC analysis of Pb-Bi peritectic alloys during solidification process was carried out to determine the solidus temperatures,liquidus temperature and temperatures of primary phase precipitation and peritectic reaction by differential scanning calorimetry.Meanwhile,nucleation under-cooling rate and volumetric fraction of primary α phase as well as latent heating of primary α phase and peritectic β phase in the pertictic alloys at varied cooling rates were presented based on analyses of DSC thermograms and solidification structure.The results reveal that with increasing in alloy composition and cooling rate,nucleation under-cooling rate of primary α phase is increased while its volumetric fraction and latent heating are decreased with increasing in alloy composition and increased with increasing in cooling rate.However,the volumetric fraction and latent heating of the peritectic β phase are increased with increasing in alloy composition and decreased with increasing in cooling rate.关键词：Pb-Bi Peritectic Alloy;DSC Thermal Analysis;Nucleation Under-cooling Rate;Volumetric Fraction;Latent Heating
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发布时间：2023-12-18 - 摘要：Interfacial reaction,interfacial microstructure,element distribution and phase constituent of Ti-47Al-2Cr-2Nb alloy melt with Y2O3 shell mold were investigated in condition of different heating temperature and holding time combining with directional solidification technology.Feasibility of Y2O3 shell mold for directional solidification TiAl alloy parts was approached.The results show that,at a given holding temperature or holding time,Al element in the melt is more easily diffused into the mold shell side than Ti element.Meanwhile,infiltrated layer with 40～70μm in thickness can be formed on surface of the alloy rod.Formation of infiltrated layer at 1600 ℃ is attributed to the introduction of Y2O3 particle into the matrix alloy as a result of erosion and thermal impaction of liquid alloy to face materials of shell mold,while it is the result of reaction of Y2O3 with liquid alloy at 1700 ℃ because of the occurrence of grey phase containing Y,O,Al around Y2O3 particle.关键词：TiAl Based Alloy;Y2O3 Shell Mold;Interfacial Reaction
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发布时间：2023-12-18 - 摘要：Entrapment-gas in the carbon fibers reinforced aluminum matrix composites melt could be reduced by vacuum degassing after stirring and mixing to resolve the damage of composites performance due to high gas porosities in prepared composites by stirring method.Relative density of the composites ingot was measured by the Archimedes law to understand effects of temperature of vacuum furnace,degassing time on compactness of the carbon fibers reinforced A356 aluminum matrix composites ingot in condition of vacuum rate of 0.03MPa.The results show that the gas porosities in the prepared composites ingot can be decreased by lower than 2% with degassing for 2 min at 700℃,and interface morphology of the composites was characterized by SEM （scanning electron microscope）,showing ideal interface with gas hole free.关键词：Vacuum Degassing;Composites;Carbon Fibers;Stirring Casting;Gas Porosities
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发布时间：2023-12-18 -
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- 摘要：Rolling deformation behavior and microstructure as well as mechanical properties of rolled Al-5Fe-1.2Si-1Mg-0.6Cu-0.5Mn alloy prepared by electromagnetic stirring method were investigated.The Al-5Fe based alloy exhibits acceptable deformation behavior during rolling process with smaller pass-reduction,while with increasing in reduction,the deformation behavior becomes worse.The alloy shows desirable deformation behavior with pass-reduction of 2～3 mm at 430～460℃.The fragmented effects of Fe-rich phase in the rolled electromagnetic sheets are greatly superior to those of electromagnetic ones.At a fixed pass-reduction,fine and uniformly distributed Fe-rich phase can be observed in the rolled sheets,and the tensile strength and elongation of the sheets at room temperature can reach 314.5MPa and 7.2%,respectively,with pass-reduction of 2 mm at 460℃,showing desirable mechanical properties.关键词：Al-5Fe Based Alloy;Rolling;Electromagnetic Stirring;Microstructure;Properties
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发布时间：2023-12-18 - 摘要：Effects of homogenization treatment and softening annealing on solid solution strengthening and as-cast microstructure and mechanical properties of Cu-10Ni-4.5Sn alloy were investigated.Tensile strength and electric conductivity of the alloy after homogenization treatment at 750℃ for 12h reach up to 241.3MPa and 5.8MS/m,respectively.Meanwhile,the electric conductivity,hardness,tensile strength and elongation of the strip in which the ingot is homogenized at 750℃ for 12 hours before cold rolling can reach up to 8.8MS/m,378.6,1275.9MPa and 3.0%,respectively,with softening annealing at 700℃ for 6 hours after 60% total deformation rate,and then with solid solution at 800℃ for 1 hours and 400℃ for 6 hours after 85% total deformation.关键词：Cu-Ni-Si Alloy;Ingot;Plate;Microstructure and Properties;Heat Treatment
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发布时间：2023-12-18 - 摘要：There exist amounts of surface blowhole,shrinkage porosities （holes） in produced aluminum alloy brake oil cylinder,resulting in seriously deteriorating the quality and production rate.Origination of defects occurrence in the brake oil cylinder was analyzed by the ProCast software.The gas hole in the castings is mainly attributed to lower pouring temperature and faster increasing velocity of filling surface.So for the brake oil cylinder with smaller cross section and flange structure,horizontal pouring can smoothly fill the cavity,effectively eliminating the defects resulting from the difficulty to exhaustion.Movable core can narrow the solidification time difference between the center and surface of the castings by greatly improving the heat emission conditions,obviously avoiding the occurrence of shrinkage porosities （holes）.关键词：Aluminum Alloy;Brake;Defects;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Modified Al-Si casting alloy was prepared by adding alloying elements,such as Cu,Ni,Mn,V,RE,and elevated mechanical properties of the alloy were analyzed.It is found that elevated mechanical properties of the alloy are improved as a result of creation of Al2Cu phase,Al7（FeMnSi）3 phase,Al6Cu3Ni and AlxV3CuRE phase in the microstructure,greatly raising the service temperature.In addition,the preparation technology exhibits the features of simple and low cost.关键词：Modification;ZL101 Alloy;Elevated Mechanical Properties
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发布时间：2023-12-18 - 摘要：Effects of minor Sc and Zr compound alloying on as-cast microstructure and mechanical properties of Al-4Cu-1.5Mg alloy were investigated.It is found that as-cast microstructure of the alloy is effectively improved by minor Sc and Zr compound addition,in which grain size is greatly refined and coarse dendrite is converted into uniform fine equiaxe grain.Tensile strength,yield strength and elongation of the alloy with 0.4% Sc and 0.2% Zr compound addition reach up to 275.0MPa,176.0MPa and 8.0%,respectively,increased by 55.3% in tensile strength and about 300% in elongation compared with Al-4Cu-1.5Mg matrix alloy.关键词：Al-Cu-Mg Alloy;Sc;Zr;Alloying;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Effects of trace Sr additions on texture of Al-Mg-Si-Cu alloy sheets were analyzed by means of ODF method （oriented distribution function）.The results indicate that the samples without Sr are mainly composed of rotating cubic texture and gace texture,where the contents are 21.245% and 38.773%,respectively.The change of the samples with 0.033% Sr addition in texture feature can be neglected,compared with sample without Sr addition,and the texture contents are slightly decreased,where rotating cubic texture and face texture reach 18.665% and 35.553%,respectively,meanwhile,maximum orientation density occurs in {011}<211>.However,the samples with 0.093% Sr exhibits distinctly change in texture features,where rotating cubic texture and face texture are drastically decreased to 0.019% and to 1.133%,respectively,and maximum orientation density appears in {112}<111>.关键词：Al-Mg-Si-Cu Alloy;Cold Rolling;Texture;XRD;Sr
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发布时间：2023-12-18 -
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- 摘要：Numerical simulation of temperature field in solidification process of large Zn based bearing bush was carried out to predict potential shrinkage porosities （holes） and its potential position in the parts and to understand effects of flow velocity of cooling water in permanent mold and cooling time on liquid phase solidification,temperature gradient distribution and shrinkage porosities （holes）.Based on simulated result,origination of shrinkage porosities （holes） occurred in the practical products was described.And the processing optimization was conducted.The practical production verifies that shrinkage porosities （holes） can be eliminated by setting chill at the bottom of water cooling permanent mold casting bearing bush to cool hot spot from the bottom and inner surface simultaneously.关键词：high Al Zn Based Alloy;Solidification Simulation;Shrinkage Porosities （Hole）;ZA303
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发布时间：2023-12-18 - 摘要：High Mn aluminum bronze ZCuAl18Mn13Fe3Ni2 is composed of multi-elements,in which the elements affect the mechanical properties of the bronze each other.It is important to optimize chemical composition to realize desirable mechanical properties of the bronze by mathematical modelization.Relationship among tensile strength,yield strength,elongation,hardness with Al,Mn,Fe,Ni elements was established by constructing BP artificial neural network model on the Matlab plateau based on lots of data from practical centrifugal casting,and availability of the model was verified by regression and prediction.500 sets predicted values in extensive scope were obtained by the model,which was comparatively analyzed with screening true value.Furthermore,combining practical data,the optimized scope of the alloy composition was presented.In addition,ingredients,impurity content,control of pouring temperature were approached.关键词：High Mn Aluminum Bronze;Centrifugal Casting;BP Artificial Neural Network;Numerical Analysis;Composition Optimization
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发布时间：2023-12-18 - 摘要：The solidification process of electromagnetic compound casting rollers was visualized and analyzed by the numerical simulation.The results indicate that the solidification process exhibits the features of from down to top and from outer to inner,which is beneficial for the liquid metal feeding and floating upward of inclusion and for the full metallurgical bonding between interfaces as well as diffusion of elements,effectively decreasing the casting defects and improving the interfacial performance.关键词：Numerical Simulation;Compound Casting;Roller;Solidification Process
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发布时间：2023-12-18 - 摘要：The history data treatment which exhibits larger and larger and just for archiving as well as not being modified and affecting the performance and efficiency was successfully resolved by introducing the ledger mechanism which was being used in financial software into foundry ERP system in which the method of reserving the user-defined data form to create the ledger was presented.Meanwhile,importance of ledger mechanism was expounded by applying the ERP system in an investment casting enterprise.关键词：Casting;ERP;Ledger;History Data
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发布时间：2023-12-18 - 摘要：We have developed a taper barrel rheomoulding machine combining with Toyo-BD-900V4-T die casting machine to understand effects of casting pressure on micro-hole morphology and density of rheo-diecasting AZ91D magnesium alloy parts.The results reveal that increasing in casting pressure can greatly eliminate the micro-hole in rheo-diecasting parts,increasing the density.The casting pressure has directly affected the micro-hole and density of the casting with pressure less than 65 MPa,however,effects of pressure can be neglected with more than 65MPa.关键词：Casting Pressure;AZ91D Magnesium Alloy;Rheo-diecasting;Compactness
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发布时间：2023-12-18 -
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- 摘要：According to practical environment of HVDC （high vacuum die casting）process in the domestic plant,a set of high vacuum control system was developed based on the PLC and touching screen technology to apply for common DC machine.The control system exhibits the features of automatically matching with DC machine and two modes feasible for general DC and for HVDC process as well as detecting die sealing and pipe blocking in vacuum system.Meanwhile,cavity vacuum in the die and blocking of vacuum pumping line can be monitored automatically in order to improve production stability and reliability of DC process.The system has been used to produce car chassis part,meeting the requirement of HVDC.关键词：HVDC;Vacuum Control System;PLC
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发布时间：2023-12-18 - 摘要：Effects of processing parameters on mechanical properties of squeezing casting ADC12 aluminum alloy connecting rod were investigated by universal materials testing machine and OM （optical microscope）.The results reveal that squeezing casting connecting rod exhibits acceptable surface quality and mechanical properties,and tensile strength and elongation reach up to 371 MPa and 7.1%,respectively.Mechanical properties of the connecting rod are obviously affected by squeezing casting parameters.The connecting rod with acceptable surface quality and mechanical properties can be obtained with preheating mould at 300 ℃ and pouring at 700℃,delaying for 8 s before pressurization and pressurizing for 322MPa.关键词：Squeezing Casting;ADC12 Aluminum Alloy;Connecting Rod;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Microstructure,castability and mechanical properties of squeezing casting Al-6.8Zn-2.6Mg-2.3Cu alloy were investigated by OM （optical microscope）,SEM （scanning electron microscope） and DSC （differential scanning calorimetry）,and a comparative analysis with those of Al-5.5Si-4.0Cu alloy was performed.The results reveal that fluidity of Al-6.8Zn-2.6Mg-2.3Cu alloy is 10.9% and 2.9%,respectively,higher than that of Al-5.5Si-4.0Cu alloy with pouring the melt at 720℃ and at 740℃,respectively.Tensile strength and elongation of the as-cast Al-5.5Si-4.0Cu alloy are higher somewhat than that of the as-cast Al-6.8Zn-2.6Mg-2.3Cu alloy with squeezing pressure increasing from 0.1MPa to 75MPa.However,tensile strength increase of the T6 treated Al-6.8Zn-2.6Mg-2.3Cu alloy is higher 100MPa than that of the T6 treated Al-5.5Si-4.0Cu alloy,which is attributed to the more effective dispersed strengthening of the Al-6.8Zn-2.6Mg-2.3Cu alloy during artificial ageing.关键词：Squeezing Casting;Al-Zn-Mg-Cu Alloy;Al-Si-Cu Alloy
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发布时间：2023-12-18 - 摘要：FEM method was used to predict the shrinkability of die castings during formation,and die castings and die casting die were modulated by the Pro/E system,meanwhile,temperature field in the die casting die were analyzed by the Ansys software.The results reveal that the method exhibits significant effects for modifying mould structure,optimizing processing parameters and improving quality of die castings.关键词：Die Casting Die;Temperature Field;Shrinkability;FEM;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Structural characteristics of die casting generator bracket were described.Effects of post treatment,such as trimming,cleaning and blast,on deformation of die casting generator bracket were analyzed.Based on analyzed result,optimization of die casting process was conducted to decrease deformation defects during post treatment,reducing scrap rate.关键词：Bracket Deformation;Trimming;Cleaning and Blast
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发布时间：2023-12-18 - 摘要：Aiming at side core-pulling in many directions and stronger wrapping force,side core-pulling by inclined slides along longitudinal and stripping plate mechanism were adopted in the die design to eliminate the problems in side core-pulling and ejecting the castings.Four inclined slides and interlinkage plate were jointed with pins,and stripping plate,interlinkage plate and ejector plate were fixed together.In the ejection,four inclined slides and stripping plate were pushed forward by ejector plate and interlinjage plate powered b ejector pins.The mould exhibits compact in structure and reliable in working and convenient in operation.关键词：Inclined Slide;Side Core-pulling;Stripping Plate;Die Casting Die
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发布时间：2023-12-18 - 摘要：Aiming at the elbow characteristics,two kinds of assembly schemes were designed to comparatively analyze the potential problems in the assembly schemes.The qualified product was produced by modifying the assembly scheme.Technologies should be taken into account comprehensively in determining assembly scheme for investment casting.关键词：Elbow;Investment Casting;Assembly
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发布时间：2023-12-18 -
- 摘要：Production process of lost foam casting steel claw was modified including adopting top pouring and setting blind riser at interfacial position of two arms with claw of the steel claw,which not only simplifyied the complex milling process and increased product efficiency but also decreased product cost and enhanced economic profit and market competition.Meanwhile,the technology could meet the requirements of save-energy and environmental protection for foundry trade.The practical production verifies the feasibility of the method.关键词：Steel Claw;EPS Pattern;Lost Foam Casting;Blind Riser
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发布时间：2023-12-18 - 摘要：Aiming at low mechanical properties and wear resistance of conventional LFC ductile iron castings,new sand was adopted to increase the cooling rate of metal melt and strengthen the chilling ability to improve the matrix microstructure,greatly increasing mechanical properties and wear resistance of ductile iron ball.关键词：LFC;Sand;Cooling Rate
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发布时间：2023-12-18 - 摘要：Mouthing core which is used for ensuring dimensional precision of formed mouthing cavity in the cast pipe is subjected to the impaction of high temperature Fe melt and enormous centrifugal forces during centrifugal pouring process.Technological index and structural characteristics of sand core were described.The identification and merits and dismerits of hand-made core-making conventional boxcore base and modified boxcore base with large aperture were analyzed.The practical production verifies that modified boxcore base can greatly decrease the failure rate of boxcore and improve appearance and formation rate of sand core as well as decreasing labor intensity and reducing energy consumption.关键词：Boxcore;Base;Mouthing Core;Hand-made Core-making;Centrifugal Casting
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发布时间：2023-12-18 - 摘要：Electrodeposited copper foil was prepared by direct current electrodeposited method,and effects of different RE additions,including 0,0.0015%,0.003% and 0.0045%,on microstructure and properties of the copper foil were investigated by SEM （scanning electron microscope）,micro-computer control electronic universal testing machine and high temperature tensile machine.The results show that RE element can obviously improve mechanical properties of the copper foil by refining and uniformly distributing grain size in the foil,where ideal grain size in the copper foil with maximum value of mechanical properties can be obtained with approximately 0.003% RE addition.关键词：Electrodeposited Copper Foil;RE Addition;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：SiCp particle reinforced aluminum matrix composites pistons have been successfully prepared by centrifugal casting at rotating velocity of 800 r/min combining with stirring method,in which slurry temperature was set at 850,850,800,800℃ corresponding to mould temperature at 600,500,600,500 ℃,respectively.Effects of slurry temperature and mould temperature on segregation of SiC particles in the aluminum matrix alloy were investigated.The results reveal that with increasing in slurry temperature and mould temperature,segregation of SiC particle becomes more and more obvious.In addition,hardness and wear resistance of the prepared piston at four kinds of processing parameters were examined.It is found that hardness of the SiC particle segregated zone is superior to that of the matrix zone,greatly improving wear resistance of the composites piston.关键词：Centrifugal Casting;SiC Particle Reinforced Aluminum Matrix Composites;Aluminum Matrix Piston;Microstructure and Properties
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发布时间：2023-12-18 - 摘要：Large bulk solidified TiC-TiB2 eutectic composite ceramics were prepared by combustion synthesis under high gravity,and the WO3 was introduced into the combustion synthesis as one of oxidants in the thermit to obtain liquid Ti-W-Cr-B phase,as a result,near-full-density TiB2-（Ti,W）C eutectic composite ceramic with macrocrack free were successfully prepared.XRD,FESEM and EDS results show that the ceramic matrix is mainly composed of TiB2-（Ti,W）C eutectic structure with a little of Al2O3 and Al2O3-ZrO2 eutectic structure existed at boundary.By introducing high gravity,Stocks immigration of immiscible liquid is taken place due to their density difference,resulting in float-up of oxide liquid and settle-down of Ti-W-Cr-C-B liquid,and the layered melt consisting of oxide liquid and Ti-W-Cr-C-B liquid is formed,finally,TiB2-（Ti,W）C eutectic composites grows from the melt.Due to the mutual solubility of W-Ti,the W atom can be diffused into the TiC,resulting in the formation of （Ti,W）C solid solution with the crystal lattice structure as the same as TiC.Relative density,Vickes hardness and fracture toughness of the composites reach up to 98.4%,26.4GPa and 7.6MPa·m1/2,respectively.
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发布时间：2023-12-18 - 摘要：Al2O3p/Al-Si composites were prepared with SiO2 as raw materials by liquid phase contact reaction technique.Microstructure,constituent,size and shape as well as distribution of created phase in the prepared composites were investigated by OM （optical microscope）,SEM （scanning electron microscope） and XRD （X-ray diffraction）.The results reveal that Al2O3 particle with approximately 1 μm in size is mainly distributed in the Al-Si eutectic structure at grain boundary.In-situ Al-Si eutectic phase with 0.3～1.5μm in size exists in particle instead of in needle structure.关键词：Al Matrix Composites;Contact Reaction Method;Al2O3 Particle
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发布时间：2023-12-18 - 摘要：Ceramic coating layer with 2～3 mm in thickness was obtained on surface of thin-walled steel pipe by SHS-centrifugal process.Microstructure of ceramic layer and interface between ceramics and steel pipe were analyzed by XRD （X-ray diffraction）,SEM （scanning electron microscope） and EDS.The results reveal that the ceramic coating is composed of Al2O3,complex compound and trace residual Fe.Interfacial transition layer between ceramic coating and steel pipe can be observed,which is beneficial for improving the interfacial bonding of ceramic coating with steel pipe.关键词：SHS （Self-propagating High-temperature Synthesis）;Centrifugal Casting;Thin Wall;Composite Steel Pipe
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发布时间：2023-12-18 - 摘要：Effects of varied ultrasonic powers and time on microstructure and properties of AZ31 magnesium alloy were investigated by introducing ultrasonic into the melt,and refining mechanism of ultrasonic on grain size in the AZ31 magnesium alloy was described.The results show that grain size in the alloy is obviously refined with the more uniform distribution as a result of comprehensive role of different effects from ultrasonic,leading to the improvement of mechanical properties.Microstructure and mechanical properties of the alloy are closely related to the ultrasonic power and time.With increasing in ultrasonic power and time,grain size is decreased and tensile strength is increased.However,there exists a critical value for ultrasonic power and time.When ultrasonic power and time exceed the critical value,the tensile strength is decreased with the slowly fining tendency of grain size.Desirable grain size and tensile strength can be observed with ultrasonic power of 600W for 100 s.关键词：AZ31 Magnesium Alloy;Ultrasonic Treatment;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Effects of processing parameters on macro-appearance of high Si aluminum alloy during frictional stirring process were investigated in condition of preheating samples.Stirring friction on the Al-30Si alloy samples preheated at 150,300,450 ℃,respectively,was conducted with stirring tool at different rotating velocity.The results show that surface macro-appearance of high Si aluminum alloy is closely related to elevated frictional stirring parameters.Preheating temperature for the samples should be appropriately matched with rotating velocity,where high preheating temperature should be matched with lower rotating velocity or lower preheating temperature should be matched with higher rotating velocity,otherwise,grooves defects could be observed in the samples.关键词：Preheating;Rotating Velocities;FSP（Frictional Stirring Process）;High Si Aluminum Alloy;Surface Defects
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发布时间：2023-12-18 - 摘要：Bubbling phenomena in gravity casting aluminum alloy cylinder head were analyzed.It is found that gas generation from sand core is one time higher than standard index,and exhausted measures are insufficient,which are responsible for the bubbling phenomena.Bubbling phenomena in gravity casting are eliminated by strictly controlling gas generation from sand core and adding vacuum pumping system on the mould.关键词：Engine Aluminum Alloy Cylinder Head;Gravity Casting;Bubbling;Gas Generation;Exhausted Gas
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发布时间：2023-12-18 - 摘要：Formation technology of forming oil circuit in aluminum alloy castings by burying copper pipe and its post cleaning process were introduced,emphasizing on analysis of corrosion copper pipe with high HNO3 solution.It is found that copper pipe in the aluminum alloy castings with damage free can be fully cleaned by corroding with 2 times calculated 65% HNO3 solution for less than 24 hours.关键词：Aluminum Alloy Castings;Oil Circuit;Buried Copper Pipe
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发布时间：2023-12-18 -
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